人工气候环境下锈蚀RC框架柱抗震性能试验研究  

Experimental investigation on seismic behaviors of corroded RC frame columns in artificial climate

作　　者：郑山锁[1] 董立国 左河山 秦卿 刘巍[1] 李强强[1] ZHENG Shansuo1, DONG Liguo1, ZUO Heshan1, QIN Qing2, LIU Wei1, LI Qiangqiang1(1. School of Civil Engineering, Xi＇ an University of Architecture and Technology, Xi＇ an 710055,China; 2. School of Architecture and Civil Engineering, Xi＇an University of Science and Technology, Xi＇an 710054, Chin)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《建筑结构学报》2018年第4期28-36,共9页Journal of Building Structures

基　　金：“十二五”国家科技支撑计划(2013BAJ08B03);国家自然科学基金项目(51678475);陕西省重点研发计划(2017ZDXM-SF-093);陕西省教育厅产业化项目(2017JC15)

摘　　要：通过人工气候环境模拟技术模拟近海大气环境,对6根剪跨比为5的RC框架柱试件进行了加速腐蚀,并对腐蚀后试件进行拟静力加载试验,研究不同钢筋锈蚀程度和轴压比对锈蚀RC框架柱承载能力、变形能力和耗能能力等抗震性能指标的影响。结果表明：锈蚀程度较严重的试件,加载过程中柱底部水平裂缝数量较少,裂缝之间的间距较大,裂缝宽度较宽;随锈蚀程度的增加,试件的承载力、变形能力和耗能能力均有不同程度的退化,由塑性铰区弯曲变形引起的柱顶水平位移占柱顶总水平位移的比例逐渐减小;当锈蚀程度相同时,随轴压比的增大,试件破坏形态由大偏心受压破坏转变为小偏心受压破坏,试件承载力先增大后减小,而变形能力和耗能能力逐渐减小,由塑性铰区弯曲变形引起的柱顶水平位移占柱顶总水平位移的比例呈下降趋势。In order to study the influence of steel corrosion level and axial compression ratio on the bearing capacity, deformation capacity, energy dissipation capacity etc. of corroded RC frame columns, six RC frame column specimens with a shear span ratio of 5 were subjected to accelerated corrosion tests by artificial climate simulation technique followed by quasi-static tests. The results show that the number of horizontal cracks at the bottom of the severely corroded specimens is relatively small, with the spacing between the cracks being relatively large and the width of the cracks being relatively wide. With increase in the degree of corrosion, the bearing capacity, deformation capacity and energy dissipation capacity of the specimens degrade to varying extents, and the column top lateral displacement caused by the flexural deformation of the plastic hinge region takes up a decreased proportion of the total column top lateral displacement. As the compression ratio increases, the failure mode of the specimens with the same corrosion degree changes from large eccentric compression failure to small eccentric compression failure, while the bearing capacity of the specimens increases at first and then decreases. In the meantime, the deformation capacity and energy dissipation capacity degrade gradually, and the column top lateral displacement caused by the flexural deformation of the plastic hinge region make up decreased proportion of the total column top lateral displacement.

关 键 词：RC框架柱 人工气候环境 近海大气环境 锈蚀程度 拟静力试验 抗震性能 

分 类 号：TU375.403[建筑科学—结构工程]